Suspension Crystallizer

Figure 7.10 Fines destruction and classified product removal during continuous mixed suspension crystallization...

Gahn, C. and Mersman, A., 1999b. Brittle fracture in crystallization processes Part B. Growth of fragments and scale-up of suspension crystallizers. Ibid. pp. 1283-1292. 

Randolph, A.D., 1969. Effect of crystal breakage on crystal size distribution from a mixed-suspension crystallizer. Industrial and Engineering Chemistry Fundamentals, 8, 58. 

Randolph, A.D. and Larson, M.A., 1962. Transient and steady state size distribution in continuous mixed suspension crystallizers. American Institution of Chemical Engineers Journal, 8, 639-649. 

Lead ring Still flange 50 mK flange Suspension crystals MC flange... 

Crystallization of Ice from Aqueous Solutions in Suspension Crystallizers... 

Several parameters have been seen to influence the crystallization of ice crystals in subcooled aqueous solutions. The primary factor is the extent of subcooling of the solution. Other factors include the agitation rate, the types and levels of solutes in solution. Huige (6) has summarized past work on conditions under which dusk-shaped and spherical crystals can be found in suspension crystallizers. The effects of heat and mass transfer phenomena on the morphology of an ice crystal growing in a suspension have not been fully understood. 

In the Badger/Niro crystallization unit, the xylenes are fed to a single-stage crystallization section that uses continuous suspension crystallization. In this section, the paraxylene is purified with a single refrigerant compressor system, and the mother liquor rejected. The purified paraxylene is fed to a Niro wash column section where ultra-high-purity paraxylene is produced by countercurrent crystal washing. 

Description Suspension crystallization of paraxylene (PX) in the xylene isomer mixture is used to produce paraxylene crystals. The technology uses an optimized arrangement of equipment to obtain the required recovery and product purity. Washing the paraxylene crystal with the final product in a high efficiency pusher-centrifuge system produces the paraxylene product. 

Washington Group International Para-xylene crystallization Hydrocarbons with over 65% p-xylene This suspension crystallization process is ideal for hirpi purity (99.9+%) p-xylene can be applied fro crystallization revamps using mixed xylenes 6 2000... 

Washington Group International Xylene, meta Hydrocarbons with over 40% meta-xylene Process separates high-purity m-xylene from hydrocarbon streams using suspension crystallizers with Niro wash columns NA NA... 

In order to be consistent with normal usage, the particle-size distribution when this parameter is used should be a straight line between approximately 10 percent cumulative weight and 90 percent cumulative weight. By giving the coefficient of variation ancfthe mean particle diameter, a description of the particle-size distribution is obtained which is normally satisfactory for most industrial purposes. If the product is removed from a mixed-suspension crystallizer, this coeffi-... 

Although such a feature can be included on many types of classified-suspension or mixed-suspension crystallizers, it is most common to use this feature with the forced-circulation evaporative-crystallizer and the DTB crystallizer. 

Figure 7-7 illustrates three common flow patterns for operation of a mixed suspension crystallizer. In each, M is the magma (slurry) outlet and O is the overflow. 

Figure 7-7 Flow patterns in mixed suspension crystallizers.

Suspension crystallization crystals and melt same temperature design on degree of supersaturation separation of crystals from melt depends on density difference in countercurrent operation. Scraped wall crystallizer (Section 16.11.4.6). 

A cross-section of a classified suspension crystallizer is shown in Fig. 11.3-3. The citea luting line drawoff is typically in the upper section of the suspension chamber and returns tangentially into the evap-... 

Fignres ) 1.3-6 and 11-3-7 show four types of mixed suspension crystallizers, several of which are fitted with upflow draft tubes and internal annular beflies. An external circulation loop generally emanates fhias the upper section of the beflied zone and enters nesr the propeller in the bottom of tha draft tube. A stmam containing fines andfor a stream of clear liquor ate tahen from ihe upper section or the annular beflied zone. 

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